Arduino Due/Timer

[wafray]

Hello,

I need program with which to control 6 outputs/ transistors with 200 or 300 khz. But i have made this one

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Инициализация на LCD дисплея с адрес 0x27 и размер 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int outputPin1 = 9; // Първи изходен пин за сигнала
const int outputPin2 = 8; // Втори изходен пин за сигнала
const int outputPin3 = 7; // Трети изходен пин за сигнала
int dutyCycle = 50;       // Запълване по подразбиране - 50%

void setup() {
  Serial.begin(9600);

  // Инициализация на LCD дисплея
  lcd.init();
  lcd.backlight(); // Включване на подсветката на LCD

  // Показване на съобщение за инициализация
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");

  delay(2000);
  lcd.clear();

  // Настройка на PWM за изходите
  setupPWM(outputPin1, 300000, dutyCycle); // Изход 1
  setupPWM(outputPin2, 300000, dutyCycle); // Изход 2
  setupPWM(outputPin3, 300000, dutyCycle); // Изход 3

  Serial.println("Signal generator at 300 kHz on three outputs.");
  Serial.println("Enter 'D' followed by duty cycle in percent (0 - 100) to set duty cycle.");

  updateDisplay();
}

void loop() {
  if (Serial.available() > 0) {
    String input = Serial.readStringUntil('\n');
    input.trim(); // Премахва излишни интервали и нови редове
    handleSerialInput(input);
  }
}

void handleSerialInput(String input) {
  if (input.startsWith("D")) {
    int newDutyCycle = input.substring(1).toInt();
    if (newDutyCycle >= 0 && newDutyCycle <= 100) {
      dutyCycle = newDutyCycle;
      Serial.print("Duty cycle set to: ");
      Serial.print(dutyCycle);
      Serial.println("%");

      // Актуализация на PWM за всички изходи
      updatePWM(outputPin1, 300000, dutyCycle);
      updatePWM(outputPin2, 300000, dutyCycle);
      updatePWM(outputPin3, 300000, dutyCycle);

      updateDisplay();
    } else {
      Serial.println("Error: Duty cycle out of range (0 - 100%)");
    }
  } else {
    Serial.println("Invalid command.");
  }
}

void setupPWM(int pin, int frequency, int duty) {
  uint32_t pwmFreq = frequency; // Честота в Hz
  uint32_t pwmDuty = (duty * 255) / 100; // Duty cycle като стойност от 0 до 255

  pmc_enable_periph_clk(PWM_INTERFACE_ID);
  PWMC_ConfigureClocks(pwmFreq * 255, 0, VARIANT_MCK);

  PIO_Configure(g_APinDescription[pin].pPort,
                g_APinDescription[pin].ulPinType,
                g_APinDescription[pin].ulPin,
                g_APinDescription[pin].ulPinConfiguration);

  uint32_t channel = g_APinDescription[pin].ulPWMChannel;
  PWMC_ConfigureChannel(PWM, channel, PWM_CMR_CPRE_CLKA, 0, 0);
  PWMC_SetPeriod(PWM, channel, 255);
  PWMC_SetDutyCycle(PWM, channel, pwmDuty);
  PWMC_EnableChannel(PWM, channel);
}

void updatePWM(int pin, int frequency, int duty) {
  uint32_t pwmDuty = (duty * 255) / 100; // Duty cycle като стойност от 0 до 255
  uint32_t channel = g_APinDescription[pin].ulPWMChannel;
  PWMC_SetDutyCycle(PWM, channel, pwmDuty);
}

void updateDisplay() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Freq: 300 kHz");
  lcd.setCursor(0, 1);
  lcd.print("Duty: ");
  lcd.print(dutyCycle);
  lcd.print("%   ");
}

And i have 300 khz - measured with oscilloscope. I cannot insert 3 pins more, because i found out that pins 7,8,9 are directly connected to PWM controller of the Due.

I have tried to insert 3 more but their frequency is 170hz and below.

My question is: Can someone to help me to configurate properly 3 more pins like 7,8,9 to generate frequency from 300 khz.

Thank you in advance!

Best Regards,

[SupArdu]

In Cortex-M3-Microcontroller-SAM3X-SAM3A_Datasheet.pdf, chapter 38.5.1, table 38-2 shows all port pins which can be used for PWM.
In a Due pinout diagram you see the references for board pin numbers and port pin numbers.